Dynamic Gravity - How to change a variable from another script?

Unity Engine
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1

New to C#, trying to learn but its a slow process

Currently working on a project where I have a GravityBody script (someone else wrote it) that applies gravity to a player character based on the direction and strength of gravity in different areas. I want to make the gravity force (GRAVITY_FORCE) change depending on the current gravity area the player is in.

GravityBody

using System.Collections.Generic;
using System.Linq;
using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class GravityBody : MonoBehaviour
{
    private static float GRAVITY_FORCE = 800;
    
    public Vector3 GravityDirection
    {
        get
        {
            if (_gravityAreas.Count == 0) return Vector3.zero;
            _gravityAreas.Sort((area1, area2) => area1.Priority.CompareTo(area2.Priority));
            return _gravityAreas.Last().GetGravityDirection(this).normalized;
        }
    }

    private Rigidbody _rigidbody;
    private List<GravityArea> _gravityAreas;

    void Start()
    {
        _rigidbody = transform.GetComponent<Rigidbody>();
        _gravityAreas = new List<GravityArea>();
    }
    
    void FixedUpdate()
    {
        _rigidbody.AddForce(GravityDirection * (GRAVITY_FORCE * Time.fixedDeltaTime), ForceMode.Acceleration);

        Quaternion upRotation = Quaternion.FromToRotation(transform.up, -GravityDirection);
        Quaternion newRotation = Quaternion.Slerp(_rigidbody.rotation, upRotation * _rigidbody.rotation, Time.fixedDeltaTime * 3f);;
        _rigidbody.MoveRotation(newRotation);
    }

    public void AddGravityArea(GravityArea gravityArea)
    {
        _gravityAreas.Add(gravityArea);
    }

    public void RemoveGravityArea(GravityArea gravityArea)
    {
        _gravityAreas.Remove(gravityArea);
    }
}

looking to add a script that I can apply to the gravity collision meshes that will change GRAVITY_FORCE

Some sort of slider to dictate the force would be ideal (not necessary though)

If anyone has any insights or suggestions it would be massively appreciated